1. 1-3-11 Cornell Notes Examples Practice
Ionic Trends
1-3-11
Cornell Notes
Examples
Practice

2. What have we learned so far?

3. Does this look familiar?

4. - Na + Cl  Na+ + Cl Octet Rule
Atoms lose, gain or share valence electrons in order to acquire the stable electron configuration of a noble gas (8 valence e-) - Na + Cl 
Na+ + Cl
Cation
Anion

5. Trends in Ion Formation
Groups 1 to 4 give their valence electrons away 1 2 13 14 Li 
Li+ Mg
Mg2+  B 
B3+

6. Trends in Ion Formation
Groups 5 to 7 take electrons 3- P  P 5 6 7 2- O  O - F  F

7. Ion - + + An atom or group of atoms with a positive or negative charge+ +
An atom or group of atoms
with a positive or negative
charge
To create an ion:
Gain an electron (to become negative)
Lose an electron (to become positive)
Example:
Lithium can lose one electron to become Li+ -

8. Ionization Energy - + + The energy needed to remove+ +
The energy needed to remove
an electron from a gaseous
atom.
Higher energy = atom holds on to electrons more tightly
Affected by nuclear charge (#of protons in nucleus) and number of energy levels -

9. Ionization Energy
Increases across a period
Increases up a group

10. Example
Which has the larger ionization energy: Lead (Pb) or Sulfur (S)?
SULFUR

11. Ionic Radius The size of an ion
Positive ions are smaller (lose electrons)
Negative ions are larger (gain electrons)

12. Ionic Radius
Positive Ions
Negative Ions
Generally Increase

13. Cl- Example Which element has the larger ionic radius: Cs+ or Cl-?
NEGATIVE
POSITIVE
Cl-

14. Practice
On the back of your notes…
Answer the questions section by section
Have your answers checked by the teacher AFTER EACH SECTION IS COMPLETED
If your answers are correct, move on to the next section
Make sure you get your work checked off after each section – it will only be graded DURING CLASS!

15. Cs+ Example Which element has the larger ionic radius: Cs+ or Mg2+
Positive Ions
Generally Increase
Cs+